The comma before 'are dead'. 'are dead' cannot stand alone. And if we were to take both commas, they ought to indicate that the part of the sentence within them could be omitted and the sentence in it's entirety would still make sense.

That would then read that the laughter tracks filmed in the 1950s (there's an extraneous apostrophe in that up there too) are dead. They were never alive to begin with, they're recordings.

Thanks for the thumbs down people, learn basic grammar before you thumb.

The comma before 'are dead'. 'are dead' cannot stand alone. And if we were to take both commas, they ought to indicate that the part of the sentence within them could be omitted and the sentence in it's entirety would still make sense.

That would then read that the laughter tracks filmed in the 1950s (there's an extraneous apostrophe in that up there too) are dead. They were never alive to begin with, they're recordings.

Thanks for the thumbs down people, learn basic grammar before you thumb.